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Digital Satellite Terminal System Revision 1

Operation MN/DST.IOM

5–2

5.1.2 Initial Power Up – Modem Only

Initially, the modem is set up and checked out and not connected to the IFL cables:

Note: Refer to the specific modem manual for programming information.

Set the modem for a known operating configuration. This includes some of the steps that

follow.

Step

No.

Selection / Programming

Menu Location

3. Disconnect the L-Band TX and RX cables from the modem. Not Applicable (NA)

4. Connect prime power to the modem. NA

5. Allow modem to complete initialization. NA

6. ODU Power = OFF Configuration: Modulator

7. Modem Transmitter = ON

(Transmitter ON (Green LED) at front panel LED is On)

Configuration: Modulator

8. LNB Power = OFF Configuration: Demodulator

9. IF Loopback = ON (Test Mode LED turns ON). This matches the L-Band

demodulator frequency to the L-Band modulator frequency.

Ensure the Mod Spectrum (Inversion) matches the Demod Spectrum

(Inversion). This is required for the demodulator to lock. See

comments in the paragraph on LO, Mix and Spectrum for loopback

over satellite (RF Loopback).

Configuration: Demodulator

Utility: Modulator

Utility: Demodulator

10. Verify the carrier is locked. (Carrier Detect LED is Green at front panel) Front Panel

11. Make sure all faults are resolved before going forward. Front Panel LEDs and LCD

Faults/ Alarms

12. IF Loopback = Off (Test Mode LED turns Off). Configuration: Demodulator

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Comtech-ef-data DST Manuale Utente Pagina 54